Refining and circulating device for paper stock



Jam. 2% 1932. J. E. BOND 1,842,577

REFINING-AND CIRGULATING DEVICE FOR PAPER s'rocx Fi1ed Aug. 28, 1929Patented Jan. .26, 1932 UNITED STATES PATENT OFFICE -.t.pp1ioation filedAugust 28, 1929. Serial No. 388,958.

My invention relates to the treatment of paper stock and particularly toa unit consisting of a tank, pump and heater arranged in a novel manner.

n The partially treated stock known as halfto the et'ficiency of thistreating operation by relit till

ducing the power consumption, increasing the capacity and efiectivenessot the refining device and improving the quality of the fiber that istreated.

ln the apparatus herein described and claimed, 1 utilize a refining andbeating device that is specifically claimed in my copending applicationSerial Number 388,957, filed o'l even date herewith.

in the combination of the devices preferably utilized, it include a tankof sufiicient size to receive a batch of adequate proportion. Means areprovided for insuring circulation of the fluid stock, such meansineluding a pump. The intake of the pump is arranged at one side of abafie in the tank and the outlet at the opposite side and at a difierentlevel. As a part of the pump unit I provide the heating or refiningengine, preferably operated by the pump motor, and on the same shaft, aquantity of the circulated material being drawn into the refiningdevice, suitably treated and directed from that point back into thetank, or after adequate treatment of the entire mass, it may be directedinto the stufi' chest.

The invention will be more readily understood by reference to theaccompanying drawings, in which Fig. 1 is a plan view of a combinationof devices such as contemplated;

Fig. 2 is a longitudinal sectional view on the line 2-2 of Fig. 1 andFig. 3 is an end view with a part of the refining device broken away toshow the internal construction.

in the drawings, 1 have illustrated an oblong tank having a mid-featheror baflle ll extending from one end wall to a point adjacent to theopposite end wall. A screw or centrifugal pump 12 is mounted exterior tothe tank, its inlet 13 being open to the space 14 at one side of thebaflle 11 while its outlet 15 is open to the space 16 on the oppositeside of the battle and at a higher point than the inlet. The floors17-18 in the tank on the inlet and outlet sides of the baffle areinclined, as shown, to facilitate the flow of material.

A refining device similar in form to a J ordan engine is indicated at 19consisting of a tapered hollow casing and a plug 20 therein havingvolute ribs 21 thereon. The plug is fixed to a shaft 22 that operatesthe screw pump impeller, amotor 23 serving to efl'ect the rotation ofthe parts. The construction of the refining device is such that itoperates as a centrifugal pump with fair efliciency, a fractionalportion of the circulated material being drawn into the refiner,properly treated and directed outward through the pipe 24 back into thetank. It may be directed into the space 16 at the discharge side of thepump or into the space 14: on the intake side as indicated at 25 by thedotted lines in Fig. 3. After suitable treatment the necessary valvesmay be manipulated and the treated material directed away from theoutlet through the pipe 26.

I may prefer to operate the apparatus as a continuous process in whichcase material is constantly or intermittently supplied to the tankthrough the pipe 9, and the material that passes through the refiner isconstantly discharged through the pipe 26. In that case the circulatingpump serves to efiectively hydrate the stock and takes the place of theordinary beater. By maintaining the stock in a thoroughly agitatedcondition and treating portions thereof in the refiner, I am able tooperate the device as a continuous process.

The construction of the refiner is specifically claimed in my copendingapplication heretofore identified, and suchconstruction is not claimedherein. It will be apparent however, that the arrangement of the partsis such that a portion of the circulated batch is directed or drawn intothe small end of the refining device due to its location at the outletfrom the pump 12. The portion withdrawn and I, the pump,

treated in the refiner is returned to the main batch and the whole massis progressively treated in that manner. By this method the entire batchis kept in constant circulation to prevent stratification, and treatmentmay be effected much more efliciently than by the known methods andapparatus.

It is obvious that the arrangement here shown is only illustrative andthat variations may be made within the scope of the. appended claims,without departure from the spirit of my invention.

I claim:

1. In combination, a tank, a pump for agitating and circulatinghalf-stuff in the tank, a refining device having its inlet adjacent tothe discharge from the pump, whereby a portion only of the circulatedmaterial is received into the refining device, and means for dischargingall the material from the refiner back into the tank.

2. In combination, a tank for receiving a batch of half-stufi, a pumpfor constantly circulating the material in the tank, a beater mounted toreceive a relatively small proportion of the half-stuff discharged fromthe pump, and means for discharging all the material from the beaterback into the main body of material.

3. In combination, a tank having a baiile, a circulating pump forwithdrawing material from one side of the baflle and discharging thesame into the tank on the opposite side of the bafiie at a differentlevel, a heater for treating a fractional part of the circulatedmaterial, and means for optionally delivering the said fractional partback to the tank or to a point of use.

4:. In combination, a tank having a bafile, a circulating pump forwithdrawing material from one side of the bafile and discharging thesame into the tank on the opposite side of the bafiie at a differentlevel, a tapered casing, and a tapered plug mounted on the pump shaftand fitting within the casing, the small end of the casing being open tothe space at the discharge from the pump, whereby the refining plug,acting as a pump, withdraws for treatment a portion of the materialcirculated by the pump.

\ 5. In combination, a tank having a baflle, a circulating pump forwithdrawing material from one side of the baffle and discharging thesame into the tank on the opposite side of the bafile at a differentlevel, a tapered casing, a tapered plug mounted on the pump shaft andfitting within the casing, the small end of the casing being open to thespace at the discharge from the pump, whereby the refining plug, actingas a pump, withdraws for treatment a portion of the material circulatedby and a pipe at the large end of the casing for delivering material toa desired point. V

6. In combination, means for constantly circulating a batch of paperstock, and means for constantly withdrawing and beating fractionalportions of the circulating stock and returning all such beaten portionsof the stock to the batch.

7. In combination, means for constantly circulating a batch of paperstock, and means for constantly withdrawing and beating fractionalportions of the circulatingstock and returning all such beaten portionsof the stock to the batch, the beater acting as a pump for effectingsuch return.

8. In combination, a tank for half stuff, a circulating and refiningunit located exteriorly of and immediately adjacent to said tank, saidunit including a pump having an impeller, said pump having inlet andoutlet connections to said tank, a refiner such as a Jordan having itssmall end open to the outlet from said pump, and a motor for operatingsaid refiner and pump.

9. In combination, a tank for half stufit', a circulating and refiningunit located exteriorly of and immediately adjacent to said tank, saidunit including a pump having an impeller, said pump having inlet andoutlet connections to said tank, a refiner such as a Jordan having itssmall end fitted against the outlet from said pump, and a motor foroperating said refiner and pump.

10. In combination, a tank for half stufl', a circulating and refiningunit located exteriorly of and immediately adjacent to said tank, saidunit including a pump having an impeller, said pump having inlet andoutlet connections to said tank, a refiner such as a Jordan having itssmall end open to the outlet from said pump, a shaft carrying therefiner plug and said impeller, and a single motor for operating saidshaft.

In testimony whereof I have afiixed my signature.

JOSEPH E. BOND.

